ID: Forewing ground colour varies from cream to orange; curved postmedian line of black dots; kidney mark white ringed black; black central basal streak passes through kidney mark; black terminal line of dots; hindwing often streaked; abdomen extends beyond tornus at rest. Antenna: male - fasciculate, bisetose, the setae long and curved; female - finely bisetose.G.algae (Rush Wainscot) lacks the black terminal row of spots, has a black kidney mark and the abdomen doesn’t extend beyond the tornus at rest. Nonagria typhae (Bulrush Wainscot) is larger (fw: 20-24mm), lacks a distinct kindey mark and lacks a postmedian row of dots.Archanara dissoluta (Brown-veined Wainscot) can be very similarly marked but is smaller (fw 12-15mm), it usually lacks a distinct postmedian row of dots and the terminal interneural markings are more like crescents that dots - where these are well-marked the veins are dark-lined (in my experience in G.sparganii the veins are usually paler than the ground colour).